If seated kokyu is THE exercise to develop the substance beneath the skill, then certainly we have to examine it and explain it in more straight forward terms.

kokyu-ho, whether standing (on one leg/2 legs) or seated (seiza/cross-legged/one butt cheek off the floor), makes no difference... It is A way.... one of many.... this is what we're trying to get at and examine and explain in straightforward terms....

Problem is... some people are missing the point and getting sidetracked into off-topic discussions about some other stuff pertaining to how wrists should rotate, and getting mired in the technicalities of how the waza is like this or that... etc. etc.

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One sits in seiza, allows one's hands to be grabbed, and with as little effort as possible attempts to topple the attacker. That's pretty much what's going on and simple enough. But if you want to have it explained further, and we all want that, then it starts to get complicated.

Is it that simple really??? How does one not use muscle power? More pertinently, shoulder power? Define "good posture"? If "good posture" is sitting up straight, how is it possible to do it cross-legged, sitting on one butt cheek, whilst scratching your other butt? Define "extension"? Breathing...? How? Why can this be done breathing in, out or holding the breath? What purpose does imagery serve? If I imagine reaching out to embrace a Playboy PlayMate, would that work? Why?

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As to the question of how or where one is grabbed, I beg to differ. There are a number points along the circle of my wrist and one is enough to form the connection. With so many points to choose from, shouldn't one point be tactically better than the rest...theoretically, of course?

Theoretically? Practically it makes no difference.... that imaginary PlayMate could be holding anywhere any which way - even as high as up the forearm, or even restraining my elbows....or hands on shoulders.... if you understand how kokyu-ho can be applied in any and all of those situations, we wouldn't be having this conversation...